<template>     
    <el-container class="home-container">
        <!-- 头部区域 -->
        <el-header>
            <div class="logo" >
                <!-- <img src="../assets/heima.png" alt=""> -->
                <span>后台管理系统</span>
            </div>
            <el-button type="info" @click="logout">退出</el-button>
        </el-header>
        <!-- 页面主体 -->
        <el-container>
            <!-- 侧边栏 -->
            <el-aside :width="isCollapse ? '64px' : '200px' ">
                <div class="toggle-button" @click="toggleCollapse" >|||</div>
                <!-- 侧边栏菜单 -->
                <el-menu background-color="#333744"
                    text-color="#fff"
                    active-text-color="#23a9f2"
                    unique-opened
                    :collapse="isCollapse"
                    :collapse-transition="false"
                    :router="true"
                    :default-active="activePath">
                    <!-- 一级菜单 -->
                    <el-submenu :index="item.id +''" v-for="item in menuList" :key="item.id">
                        <!-- 一级菜单的模板区 -->
                        <template slot="title">
                            <!-- 图标 -->
                            <i :class="iconObj[item.id]"></i>
                            <!-- 文本 -->
                            <span>{{item.authName}}</span>
                        </template>
                            <!-- 二级菜单 -->
                           <el-menu-item :index=" '/' + subItem.path" v-for="subItem in item.children" :key="subItem.id"
                               @click="saveNavState('/' + subItem.path)">
                               <template slot="title">
                                    <!-- 图标 -->
                                    <i class="el-icon-menu"></i>
                                    <!-- 文本 -->
                                    <span>{{subItem.authName}}</span>
                                </template>
                           </el-menu-item>
                    </el-submenu>
                </el-menu>
            </el-aside>
            <!-- 右侧内容 -->
            <el-main>
                <!-- 路由占位符 -->
                <router-view></router-view>
            </el-main>
        </el-container>
    </el-container>
</template>

<script>
export default {
    data(){
        return{
            // 左侧菜单数据
            menuList:[],
            iconObj:{
                '125':'iconfont icon-user',
                '103':'iconfont icon-tijikongjian',
                '101':'iconfont icon-shangpin',
                '102':'iconfont icon-danju',
                '145':'iconfont icon-baobiao'
            },
            // 不折叠
            isCollapse:false,
            // 被激活的链接地址
            activePath:''
        }
    },
    created(){
        this.getMenuList(),
        this.activePath = window.sessionStorage.getItem('activePath')
    },
    methods:{
        logout(){
            window.sessionStorage.clear();
            this.$router.push('/login');
        },
        // 获取所有的菜单
        async getMenuList(){
            const { data: res} = await this.$http.get('menus')
            if(res.meta.status !== 200) return this.$message.error('res.meta.msg')
            this.menuList = res.data
        },
        // 菜单折叠/展开
        toggleCollapse(){
            this.isCollapse = !this.isCollapse
        },
        // 保存菜单选项的激活状态
        saveNavState(activePath){
            window.sessionStorage.setItem('activePath',activePath)
        }
    }
    
};
</script>

<style lang="less" scoped>
.home-container{
    height: 100%;
}

.el-header{
    background-color:  #373d41;
    display: flex;
    justify-content: space-between;
    padding-left: 0;
    align-items: center;
    color:  #fff;
    font-size: 25px;
    > div{
        display: flex;
        align-items: center;
        span{
            margin-left: 15px;
        }
    }
}

.el-aside{
    background-color:  #333744;
    .el-menu{
        border-right: 0;
    }
}

.el-main{
    background-color:  #eaedf1;
}

.iconfont{
    margin-right: 10px;
}

.toggle-button{
    background-color: #4a5064;
    font-size: 10px;
    line-height: 24px;
    color: #fff;
    text-align: center;
    letter-spacing: 0.2em;
    cursor: pointer;
}
</style>